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Question

In above shown figure, a ball of mass m strike the wall with velocity V and rebounds back with same velocity. Calculate the change in momentum.
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  1. 2mV directed to the left
  2. mV directed to the left
  3. Zero
  4. 2mV directed to the right
  5. mV directed to the right

A
mV directed to the left
B
mV directed to the right
C
2mV directed to the left
D
Zero
E
2mV directed to the right
Solution
Verified by Toppr

Initial momentum =mV and after rebound from the wall the final momentum =mV (negative sign is due to V is opposite to initial V )
So change in momentum =mV(mV)=2mV
The negative sign indicates it is directed to left.

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